WordNet (r) 3.0 (2006):

trove
    n 1: treasure of unknown ownership found hidden (usually in the
         earth) [syn: treasure trove, trove]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "trove":
   agglomeration, aggregation, amassment, bonus, bringing to light,
   buried treasure, casual discovery, catching, chance discovery,
   collection, colluvies, conglomeration, cumulation, detection,
   determination, determining, disclosure, discovery, distinguishment,
   espial, excavation, exhumation, exposure, find, finding,
   finding out, foundling, gravy, hoard, invention, locating,
   location, lucky strike, recognition, rediscovery, revelation,
   serendipity, spotting, strike, treasure trove, trouvaille,
   uncovering, unearthing, waifs, waifs and strays, windfall,
   windfall money, windfall profit